Not all lenses are made the same. We all know that. But let me point out the obvious.
I do not like variable lens length much the same I don't like variable f/stop in zooms. That is lens protrudes or retracts externally when zooming out or in or even simply changing focus distance*. I much appreciate the lens elements move internally and the overall lens length remains fixed during focusing and zooming.
* the oldie manual focus lenses actually do that, they protrude from a few mm to cm when focusing close, I actually don't get bothered by it. The AF 135 f/2 DC is truly fixed length no matter what focusing distance.
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